Line Progression?

Angel

Im still technically a day or two before AF. The first positive was on 10 DPO and I think theyre getting darker but the bottom isnt a FRER. Is it getting darker? This doesnt look like a chemical right?? Tried for 4 years. Really scared Im gunna lose the baby.

1st 10dpo

2nd 11 dpo

3rd 12 dpo (today)